Electric hammer



Aug'. 14, 41923. 1,464.824

G. L.. KoLLocK ET AL ELECTRIC HAMMER Filed March 22, 1922 V vwamtoz.)

Patented Aug. 14, 1923.

UNITEDl STATES PATENT OFFICE.

GEORGE L. KOLLOCK AND ROBERT P. MARTIN, OF SEATTLE, WASHINGTON, ASSIGNORS TO ELECTRIC HAMMER COMPANY, OF SEATTLE, WASHINGTON, A CORPORATION OF WASHINGTON.

ELECTRIC HAMMER.

Application led March 22, 1922. Serial No.l 545,819.

To all whom t may concern.

Be it known that we, GEORGE L. KoLLooK, a citizen of the United States, residing at Seattle, in the county of Kin and State of Washington, and ROBERT P. ARTIN, a citizen of the United States, residing at Seattle, in the county of King and State of Washington, have invented certain new and useful Improvements in Electric Hammers, the following being a'full, clear, and 'exact dis closure of the one form of our invention which we at present deem preferable.

For a detailed description of the present forni of our invention, reference may be had to the following specification and to the accompanying drawing, wherein- Fig. 1 is a longitudinal vertical section yof an electric hammer containing our invention and Fig. 2 is a horizontal section of the gearf in and cam.

ur invention resides in the expedient of two oppositely rotating bevel-gears having reversely-set cams which, although rotating in opposite directions co-operate to periodically lift and release the hammer against the forceof its operating spring. In the drawing A represents the shell of an electric hammer which may be made in separable parts convenient for assembling and replacin of the several members, as is now well {nown in the art. B is the armature of the operating electric motor, and C the ield magnet. lThe motor shaft extends axially of the machineand at its inner end is a bevel-pinion D which meshes with two parallel bevel gear-wheels E1, E2 and rotates them in opposite directions. Inside of each wheel is a two-ste cam H, the one shown in Fig. l being in tllie gear-wheel E1 and rotating in a clockwise direction. These cams act respectively in the projections, preferably rollers, rollers K1, K2 which project from the opposite sides of the hammer F and twice in each rotation they cooperatively lift the hammer against the force of its operating spring G and release it.` At each release the sprin forces the hammer out and causes it to give a sudden impact or blow upon the tool which may be includedy inthe chuck J at its extremit It will be observed that the gear-wheels E7 and E2 have rearwardly projecting stubshafts e1 and e2 which are journalled in bearings in the shell A. By this arrangement the space between the wheels is left free for the play of the inner end of hammer F and the rollers K1, K2 thereon.

What we claim as new and desire to secure by Letters Patent is:

13. An electric hammer, comprising an electric m'otor, a bevel-pinion on the motor shaft, two bevel gear-wheels both driven by the said pinion but in opposite directions, a hammer with projections on opposite sides thereof extended intov the space between the gear-wheels, an operating spring yfor the hammer, and oppositely-rotating cams on the adjacent sides of the respective gearwheels acting co-operatively on the said hammer projections. l

2. An electric hammer, comprising an electric motor, a bevel-pinion on the motor shaft, two bevel other with rear-si e journals therefor and both engaging the said pinion, a hammer with opposite projections thereon extended into the space betweenA the two gear-wheels, and oppositelyrotating cams on the inner sides of the respective gear-wheels acting co-operatively on the said hammer projections.

Sixgned at Seattle, county of King, State of ashington, this 10th day of March, 1922.

GEORGE L. KoILLooK. ROBERT P. MARTIN.

(gear-wheels facing eachA 

